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* @license Apache-2.0
*
* Copyright (c) 2016-2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
var sqrt = require('@stdlib/math/base/special/sqrt');
var exp = require('@stdlib/math/base/special/exp');
var pow = require('@stdlib/math/base/special/pow');
var PI = require('@stdlib/constants/float64/pi');
// var TWO = require('@stdlib/constants/float64/two');
const TWO = 2.0;
function pdf(x, sigma) {
if (sigma <= 0.0) {
return NaN;
}
if (x < 0.0) {
return 0.0;
}
return sqrt(TWO / (PI * pow(sigma, 2))) * exp(-pow(x, 2) / (TWO * pow(sigma, 2)));
}
module.exports = pdf;
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